Unfortunately, starting from update 18 now, the popgroups files containing real-life vehicles were removed. This is done as many people were reporting stuttering performances and crashes in their game when they use the said popgroups. However, you can always configure the popgroups to your liking and you can always add any vehicles you want into traffic. (See readme on how to add your own cars to traffic for this)

@Jonathan6506@AlexanderWest Neither works for me, I put everything right, and been 2 hours circling and no exotic vehicle. My gta is an original version, something is failing because they are not generated!!!!!

@DktekejasDesbri@Jonathan6506 also you can edit popgroups.ymt file to your liking.
Especially in rich area of LS, Jonathan has put almost all high-end dlc vehicles to spawn just in case but you can always remove the cars you don't want to see and increase the chances to see your own cars.Such as myself removed Alpha, Elegy, Sultan, F620 and some other richman's cars to make way for my own cars and it mostly worked.

@Jonathan6506 I have a question too:
I want some cars spawning more frequently and some others less in particular area.For example, I want to see F620 more(though I removed it but just an example) whereas Penetrator or Swinder much less as they are limited edition cars.
I did tested your popgroup in fully vanilla game but it was really frustrating to see 5 different Swingers.I took a look popgroups.ymt file but I don't think I could change that?
Any help please?

I have the mod working and I have to say it is amazing! I have checked your vehicles.meta file and not every vehicle that has been added is in there so I can not change the frequency of them, like the "nero" and "nero2" for example.

@GTAEU-MODS So just because I dislike your mods and you intentionally bad rates and damage the reputation of my mod? Also, your comments were all nonsense here. Also, calling someone's mods as misc and useless were completely obsolete here, it's useful for most people. People like you deserve to be banned from the site.

@Jonathan6506 u too disliked my mod and ur comment was none sense i can do a mod i like u sed i was destroying the car only cause its a monster truck version i support this site by uploading my mods but this site not supports me im just wasting my time this site never protect me from bad rating or comments and dont feature my best good mods so u feel free to bann me but delete all my mods from this site cause its my work

@Jonathan6506 idk why u think that, a car can be tuned in many ways and its not ruined, its a diferent version cause there is many cars and in real life there is too and the car before be a monster truck is normal one the vehicle can be only ruined when is destroyed or damaged thats what i think

@Jonathan6506 Thanks for your quick reply (appearently and sorry my late response :))
I have two more questions

1-Let's say I have removed a vehicle from popgroups (for example Buffalo), in that case do I have to remove it from vehicles.meta file or there is no need to remove as the game doesn't read it since it was removed from popgroups
2-I have just downloaded couple of add-on vehicles(Benefactor Schwartzer Classic to be specific), I did add them to popgroups to get naturally spawned in traffic, no problem until here.But since, it's an addon vehicle it doesn't have vehicle.meta entry, so can I just create a specific entry for it by copying any other vehicle's entry and replace its display name etc with Schwartzer Classic's and continue my editing MaxNum etc?

Abit long question sorry but I can be more specific if you need clear understanding
Thank you
Burak

1. No need. For example, if you don't want a vehicle on traffic (for example Buffalo), just remove the Buffalo line (<Item><Name>buffalo</Name><Variations type="NULL"/></Item>) from popgroups.ymt. Then the game will de-register the said vehicle (Bravado Buffalo) from traffic. You don't have to remove the vehicle line from vehicles.meta.

2. Yes, you can always use other vehicle's entry line and change the entry name to the one you want.

I think Schwartzer Classic's vehicle entry name is 'schwartzerc', so you can copy any vehicle line and do it like this: